Valley temperatures could reach 110 degrees on Sunday as a pollution advisory remains in effect for the third consecutive day.

National Weather Service officials said the Phoenix area should be prepared for temperatures to exceed 110 degrees on Sunday, giving the chance of that happening  20-40 percent.

At the least, temperatures will be in the range of 105 to 110 degrees, forecasters said early Saturday afernoon.

“Moderate heat risk will become widespread starting Sunday,” according to the Weather Service’s website.

On Monday, Valley residents should expect the hottest day of the year so far with up to a 70 percent chance that temperatures will exceed 110 degrees, according to the Weather Service.

Temperatures are expected to hover near or slightly above 110 degrees for the rest of the week and approach 115 degrees on July 4, forecasters said.

An ozone high-pollution advisor has been in effect since Friday and will continue through Sunday, according to Maricopa County air quality officials.